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Your brain uses about a fifth of all the energy your body makes.

Your brain uses about a fifth of all the energy your body makes.

Even though the brain is only about 2% of your body weight, it uses roughly 20% of your energy. Thinking, sensing, and controlling your whole body takes a lot of power.

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Your heart beats about 100,000 times every day. Your heart beats about 100,000 times every day. You are a little taller in the morning than at night. You are a little taller in the morning than at night. You can’t tickle yourself. You can’t tickle yourself. Your bones are alive, and they grow with you as you get bigger. Your bones are alive, and they grow with you as you get bigger. Babies are born with about 300 bones, but grown-ups have only 206. Babies are born with about 300 bones, but grown-ups have only 206.